<template>
  <Swiper :options="option">
    <SwiperSlide v-for="(item,index) in skuImageList" :key="index">
      <img
        :src="item.imgUrl"
        alt=""
        :class="{ active: currentIndex === index }"
        @click="changeIndex(index)"
      />
    </SwiperSlide>
    <!-- //前进后退按钮 -->
    <div class="swiper-button-prev" slot="button-prev" @click="minus"></div>
    <div class="swiper-button-next" slot="button-next" @click="add"></div>
  </Swiper>
</template>

<script>
import { Swiper, SwiperSlide } from "vue-awesome-swiper";
import "swiper/css/swiper.min.css";
import { mapGetters } from "vuex";
export default {
  name: "ImageList",
  components: {
    Swiper,
    SwiperSlide,
  },
  computed: {
    ...mapGetters(["skuImageList"]),
  },
  data() {
    return {
      option: {
        //前进与后台按钮配置项
        navigation: {
          nextEl: ".swiper-button-next",
          prevEl: ".swiper-button-prev",
        },
        //同时展示几张图片设置
        slidesPerView: 3,
        //每一次切换，切换掉两张图片图片
        slidesPerGroup: 1,
      },
      //保存底部图片的选中索引数值
      currentIndex: 0,
    };
  },
  methods: {
    //点击小图
    changeIndex(index){
      this.currentIndex = index;
      //通过全局事件总线给兄弟传索引数值
      this.$bus.$emit('sendIndex',this.currentIndex);

    },
    //点击后面按钮
    add(){
      this.currentIndex++;
      this.$bus.$emit('sendIndex',this.currentIndex);
    },
    //点击前面按钮
    minus(){
      this.currentIndex--;
      this.$bus.$emit('sendIndex',this.currentIndex);
    }
  },
};
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>
